endoplasmic reticulum?

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Answer 1

Well the endoplasmic reticulum or ER is an organelle found in all eukaryotic cells that is an interconnected network of tubules, vesicles and cisternae that is responsible for several specialized functions: Protein translation, folding, and transport of proteins to be used in the cell membrane (e.g., transmembrane receptors and other integral membrane proteins), or to be secreted (exocytosed) from the cell (e.g., digestive enzymes); sequestration of calcium; and production and storage of glycogen, steroids, and other macromolecules.[1] The endoplasmic reticulum is part of the endomembrane system. The basic structure and composition of the ER membrane is similar to the plasma membrane.

Visit http://en.wikipedia.org/wiki/Endoplasmic_Reticulum for more info

Answer 2

Crisscrossing the cellular cytoplasm is a fine network of tubular structures called the endoplasmic reticulum. Some of this endoplasmic reticulum connects the nuclear membrane to the cell membrane: thus, it serves as a channel for the transport of materials in and out of the nucleus. Sometimes the endoplasmic reticulum will accumulate large masses of proteins and act as a storage area.

Two types of endoplasmic reticulum are rough and smooth. Rough endoplasmic reticulum has ribosomes studding the outer membrance. The ribosomes are the sites for protein synthesis in the cell. The smooth endoplasmic reticulum has a role in cholesterol synthesis, fat metabolism, and detoxification of drugs.

Answer 3

This is a system of folded membranes in the cytoplasm of a eukaryotic cell.

If it's rough endoplasmic reticulum, then it has ribosomes stuck on the outside of it. It processes and transports proteins made by the ribosomes.

If it's smooth endoplasmic reticulum, then it does not have ribosomes stuck on the outside of it and is more likely to process and transport lipids and carbohydrates.